Control door for heating apparatus



6,442 A. M. MERTZANOFF I CONTROL DOOR FOR HEATING APPARATUS Filed April 30. 1923 if] W'- s Patented Aug. i7, 192%.

UNHTED STATES.

-i T 15%,442 PATENT OFFICE.

ANDRE M. MERTZANOFF, OF NEW YORK, N. Y., ASSIGNOR TO AMERICAN RADIATOR COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

CONTROL DOOR FOR HEATING APPARATUS.

Application filed April 30, 1923. Serial No. 635,533;

My invention relates to improvements in heating apparatus, and the same has ref orence more particularly to that type of heat ing apparatus in which the operation there of may be automatically controlled.

Further, said invention has for its object to provide a heating apparatus in which the fuel consumption and. the operation of the apparatus are positively controllable by thermosensitive means, which is automatically responsive to the conditions obtaining within the apparatus.

Further, said invention has for its object to provide a'heating apparatus of the type specified by means of which the automatic control of the draft, and the rate of fuel consumption cannot be impaired, or interfered with by the manipulation of the doors or closures for sealing the fuel. opening, slicing opening or ash pit opening.

Further, said inventionhas for its object to provide a heating apparatus of the type specified having a cold air inlet and means for automatically controlling the supply of air'thereto, and having the usual fuel supply opening and ash pit opening provided with doors, and one of said doors being so constructed and arranged with respect to the other thereof as to render it impossible to open one of said doors without first-opening the other thereof.

Further, said invention has for its object to provide a heating apparatus of the type specified having the usual fuel supply opening and ash-pit opening, and a door primarily controlling the fuel supply opening but so constructed and arranged with respect to the ash-pit opening that the latter cannot be opened or uncovered without first opening and maintaining open the doorof the fuel supply opening, and also. rendering it impossible to close said fuel supply door without closing or sealing the ash-pit opening.

Further, said invention has for its object to provide a heating apparatus of'the type specified equipped withautomatic means for supplying cold air to the ash-pit, and means which render impossible any interfering with the operation of automatic controlling means by the manipulation or adjustment of the doors of the fuel supply opening and of the ash-pit opening, or either thereof.

Further, said invention has for its object to provide a heating apparatus having means r .for preventing the overheating thereof, and

the resulting cracking or burning out of said apparatus or any of the parts thereof.

In the operation of boilers equipped with automatic or thermosensitive draft controlling means, it has been found that the opera tor, particularlywhere the boiler is of the smaller sizes used for residence heating, frequently seeks to accelerate the operationof the boiler, and to that end attempts further to regulate the same by -man'ipulating the doors ofthe ash-pit and the fuel supply openings, or either thereof, and as a result the normal operation of the automatic draft controlling device is either materially impaired, or the device rendered wholly inoperative, and the proper and intended operation of the boiler rendered impossible. To provide means for preventing such improper manipulation of the furnace doors, and to insure the proper operation of the thermosensitive or automatic draft controlling device is, therefore, the principal object of the present invention.

Other objects will in part be obvious, and

in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends my invention consists in the novel details'of construction, and in the combination, connection and arrangement of parts hereinafter more fully described and then pointed out-in the claims;

In the accompanying drawings illustrating one form or embodiment of mysaid invention v Figure 1 is a front elevation showing a boiler with my invention embodied therein;

'Fig. 2 is a similar view with the control ling door opened, and 4 Fig 3 is a central longitudinal section.

In said drawingslO designates a boiler, which for the purpose of illustrating the invention, is'here showncomposedofa front section 11, a back section 12, and a plurality of intermediate sections 13. The front section is provided with the usual fuel supply opening 14, slicing opening 15 having a separate'hinged door 15 and an ash-pit 0 en- ,ing 16 also having a separate hinged coor The back section is provided with a 16 smoke outlet 17, and a cold airinlet 18 communicating with the interior of the boiler below the grate 19. The cold air inlet 18 is provided with a cover 20 which is hinged along its upper edge, and its lower free edge is connected to a rod 21 whose upper end is pivotally connected to one end of a lever 22 of a thermosensitive device 23 mounted upon the top of the boiler adjacent the rear end thereof.

The back SBitlOll intermediate sections 13 iacent to their upper portions with registering transverse, hollow water members 2i forming a horizontal flue 25 extending from the front the combustion chamber 26 to the smoke outlet 17.

Upon the from of the front section ll is secured a rectangular plate or casting; 27 having openings, ren istoring respectively with the fuel. supply opening; 1%, slicing); opening; 15, and ash-pit opening 16 in the front section of the boiler, and adjacent to one of the vertical edges of said plate 2? are provided hinge members 31, 31 upon which work the registering; hinge members 32. 32 of a door 33 having a rearwardly extending]; rim or flange 34. The door is provided with a transverse rib or web in order to form a complete peripheral enclosure 'or door proper for the fuel supply opening 1 1:. The lower portion of the door 33 extendii below the rib or web forms an extension or apron and is of such size that the same completely encloses or controls the slici opening; 15 and ash-pit opening; 1%, and the individual doors therefor.

The outer surface of the plate rim or flange 34, as well as the transv 12 and a number of the are provided ada 24 and the rib or web are preferably ground in order to form a substantially air tight closure, since all the air necessary to support conibustion is admitted by way of the cold air inlet 18 at the rear of the boiler. and controlled by the thermosensitive device 2 3 and connected parts.

The operation of the boiler wi. obvious. The fuel is introduced fuel supply opening 14:, and the J drawn through the openin 16 in the usual manner. The supply of z r provided wholly by of the inlet 18, and the products of combustion and the hot pass from the combustion chamber 26 through the fine 25 to the smoke outlet 1'? to the s IClT.

The supply of cold air through the inlet 18 at the rear of the boiler is automa" cally controlled by the thermosensitive do. .c acting upon the cover 20, and serves to open or close the same in accordance with the conditions obtaining within the boiler.

I By reason of the cons. u -tion of the fuel supply door 33, the automatic actuation of thecover20 of the cold air inlet 18 lie-- comes positive. and certain, and any attempt to force the boiler beyond the m'edetermined degree, as determined by the therinosensitive device is rendered impossible, The only way in which the fire can ordinarily be forced in the usual type of boiler or heating apparatus is by opening the draft in the sino 41s as 2 es 7 pass through to the passage of cold air, the greater pa t or volume ol' the air entering the boiler will the fuel opening 1 consecfguently check all tendency to force the lire. It also follows that the 'l0Sl11;

33 controlling the fuel opening l-l will act to close the ash-pit door 16, well as the slicing door 17 should that have been opened, and reestablish the normal operating conditions within the boiler, and the tale ie' of the entire air supply through the air inlet 18 at the back of the boiler.

it is to be noted that in order to insure the absolutely automatic operation of the draft control, the door controlling the fuel supply 01 ening 1% must be so constructed and arranged with reference to the ash-pit opening 16, that the latter cannot permit cold air to enter therethrough, or permit the door thereof, (when said opening is provided with one), to be opened without openii the former, and that the former cannot be closed without discontinuing the supply of cold air to the ash-pit opening, or closing the door thereof; When the boiler provided with a slicing opening 15, or any other openings in addition to the fuel and ash-pit openings, the fuel supply door must, of course, similarly control such other or additional opening or the doors thereof in order to prevent, or in any way affect. the due operation of the automatic draft con trolling means.

It is to be noted that while I. have shown and described my saidiuvention in connection with a hot water boiler the same is equally applicable to steam boilers hot furnaces, stoves, and other forms of heating apparatus, and while the same is of particular advantage in apparatus wherein the draft is controlled by automatically operated regulating deof the door connection with heating ices, the same isnevertheless ofvvalue when opening and said ash-pitfopening; coactin'g' to prevent the admission of air through said ash-pit opening without simultaneously admitting air through said fuel supply opening, substantially as; specified. v

2. A. heating apparatus havinga fuel supply opening, an ash-pit opening, means for controlling said openings and servin when in closed position, to prevent the mission of air therethrough; the portions of said means controlling said fuel supply opening and said ash-pit opening coacting to prevent the admission of air through said ash-pit opening without simultaneously ad} mitting air through said fuel supply opening, and a separate draft inlet for admitting below the fuel the normal supply of air necessary to support combustion, substantially as 'specified.

A heating apparatus having a plurality of openings, including a' fuel supply opening. means for controlling said openings and serving, when inclosed position, to prevent the admission of air therethrough; the portions of said means controlling said openings coacting to prevent the admission of air through certain of said openings without simultaneously admitting air through said fuel supply opening, a separate draft inlet for admitting below the fuel the normal supply of air necessary to support combustion, and means for controlling the admission of air to said draft inlet, substantially as specified.

4. A heating apparatus having a plurality of openings, including a fuel supply opening and an ash-pit opening, a separate draft inlet for admitting below the fuel the normal supply of air necessary to support combustion, means for automatically controlling the admission of air to said draft inlet, and means for controlling said first named openings and serving, when in closed position, to prevent the admission of air through said first named openings; said last named means serving to insure the admission of air through certain of said first named openings when air is admitted through other thereof, substantially as specified.

5. A heating apparatus having a plurality of openings, including a fuel supply opening, a separate draft inlet for admitting below the grate the normal supply of air necessary to support combustion, means for automatically controlling the admission of air to said draft inlet, and means for controlling said first named openings and serving, when in closedposition, to prevent the admission of air through said first named openings; the portions of said means controlling said first named openings coacting to insure the admission of air through said fuel supply opening simultaneously with the admission of air through other of said first named openings, substantially as specified.

6. A heating apparatus having an ash-pit opening, a fuel supply opening, a separate draft inlet for admitting below the fuel the normal supply of air necessary to support combustion, means for automatically controlling the admission of air tosaid draft inlet, and closures for said fuel supply opening and said ash-pit opening serving, when in closed position, to prevent the admission of air through said fuel supply and ash-pit openings; the closure for said fuel supply opening serving to control the operation .of the closure for said ash-pit opening, sub stantially asspecified.

7. A heating apparatus having an ashpit opening, a fuel supply opening, a separate draft'inlet for admitting below the grate the normaltsupply of air necessary to support combustion, means for controlling the admission of air to said draft inlet, and

a member for controlling said fuel supply opening and enclosing said ash-pit opening, and serving, when in closed position, to prevent the admission of air through said fuel supply opening and said ash-pit opening,

substantially as specified.

8. A heating apparatus having an ashpit opening, a fuel supply opening, a separate draft inlet, means for controlling the admission of air to said draft inlet, and means for controlling said first named openings and serving, when in closed position, to prevent the admission of air through said first named openings and rendering said ash-pit opening inoperative to admit air therethrough when said last named means is adjusted to prevent the admission of air through said fuel supply opening, substantially as specified.

9. A heating apparatus having an ash-pit opening, a fuel supply opening, a draft inlet for admitting below the grate the normal supply of air necessary to support oombustion, means for controlling the admission of air to said draft inlet, a separate door for said ash-pit opening, serving, when in closed position, to prevent the admission of air through said ash-pit opening, and a' door for closing said fuel supply opening and enclosing said ash-pit opening and the door therefor; said door serving, when in closed position, to maintain said ash-pit opening closed whereby to prevent the admission of air through said ash-pit opening without simultaneously admitting air through said fuel supply opening, substantially as specified.

10. A heating apparatus having an ashpit opening, a fuel supply opening, and a door for closing said fuel supply opening and enclosing said ash-pit opening, and serving, when in closed position, to prevent the admission of air through said openings; said door serving to prevent the closing of said fuel supply opening without closthe same to said fuel supply opening, sub

stantially as specified.

11. A heating apparatus having an ashpit opening, a fuel supply opening, a separate draft inlet for admitting below the fuel the normal supply of air necessary to support combustion, means for controlling the admission of air to said draft inlet, and a door for closing said fuel supply opening and enclosing said ash-pit opening, and serving, when in closed position, to prevent the admission of air through said fuel and ash-pit openings; said door serving to prevent the closing of said fuel supply opening without closing said ash-pit opening, whereby to prevent the admission of air through said ash-pit opening vwithout simultaneously admitting air through said fuel supply opening, substantially as specified.

12. A heating apparatus having an ashpit opening, a fuel supply opening, a separate draft inlet for admitting below the fuel the normal supply of air necessary to support combustion, means for controlling the admission of air to said draft inlet in response to conditions within said heating apparatus, and a door for said fuel supply opening having an extension enclosing said ash-pit opening, and serving, when, in closed position, to prevent the admission of air through said fuel and ash-pit openings;

said door serving to prevent the admission of air through said ash-pit opening W thout simultaneously admitting air through said fuel supply opening, substantially as specified.

Signed at the city of New'York, in the county and State of New York, this 22d day of'March, one thousand nine hundred and twenty-three.

ANDRE M. MEBTZANOFF. 

